Tungsten Market strong bullish sentiment, but reluctant to sell goods holders

Tungsten market: Tungsten bullish market sentiment strong, but cargo operators reluctant to sell, and no non-cash shipments of raw materials tungsten concentrate market was particularly evident with the recent warming trend, some traders even bargain now hoarding tungsten mine, smelter downstream home also dth hammer bits intends to purchase part of the reserves of raw materials, market inquiry purchases increased. Some, such Water Well Drilling as tungsten APT smelter family funds still not in place, the actual turnover is still small, is expected Rock Drilling Tool in the short term or ore prices stable and strong.

Molybdenum market: raw materials market movements slow, with little bulk transaction occurs, mining companies offer steady weakening downstream buyers hold stocks in order to avoid the risk, continue to reduce production costs and further depress purchases psychological level. Short-term market is expected to continue weakening operation.

Tungsten products prices stable, steady businesses mostly watching

Tungsten products market running smoothly. The current mainstream market trading price of tungsten powder is still concentrated in the 261-263 yuan / kg, native tungsten concentrate in 259-261 yuan / kg, low-cost resources to further reduce the high quote still exists, but little difference between the transaction price. Tungsten concentrate prices stabilized, powder merchant power weakens the price adjustment, the majority holding steady taper drill bit on the sidelines.

Mainstream tungsten steel concentric drill bits market price is still concentrated in about 290 yuan / kg, Hard Rock Drill Bits between high-purity tungsten 320 yuan / kg, tungsten wire 415-455 yuan / kg, tungsten rod 355-380 yuan / kg. Manufactures spot market limited resources, relatively low power price adjustment businesses, steady watching the majority, so the market is relatively stable. Short-term market is expected to continue to remain stable tungsten products.

Summary of DTH knowledge popularization and daily storage detailed steps

Original title: Summary of detailed steps for the popularization of down-the-hole drilling tools and daily preservation

Size selection of down-the-hole impactor, drill bit and drill pipe

The size of the down-the-hole impactor mainly depends on the hole diameter and the type of rock.For blast holes, the diameter range of the down-the-hole drilling is from 89mm To 252mm, Less than 89mm The aperture is mainly the top hammer type, which is larger than 252mm Multi-purpose rotary drilling method of hole diameter.

Generally speaking, DTH impactor can be applied The smallest aperture is its nominal size,it means The smallest aperture for an inch impactor is4Inch aperture.Generally speaking, in this case, between the impactor and the hole wall, between the drill pipe and the hole wall, there is enough annular space for slag discharge.

The maximum size of the matching drill bit is the size of the impactor plus 1 Inch, For example, matches The maximum bit size of an inch impactor is 5 Inch.

The closer the outer diameter of the drill pipe to the outer diameter of the impactor, the better, Can ensure better slag discharge, but also reduce the possibility of stuck drill.

From the processing technology of drill pipe (drill pipe),The surface finish and dimensional accuracy of cold drawn tubes are better than hot rolled tubes.Good surface finish means that the surface of the steel pipe is not easy to peel, and the metal chips caused by the peeling will reduce the service life of the impactor.In addition, if the thread of the drill pipe and the connection part of the main body are usedFriction welding Even better, it can increase the strength of the drill pipe. At the same time, the heat treatment of the threaded part is done well, which can increase the reliability and strength of the thread, make the connecting and unloading rods smoother, and improve the work efficiency and the overall piercing speed..

Choosing the right down-the-hole drill bit

Let's take a look at the drill bit. The body of the drill bit is usually machined by cemented carbide, and then heat treated to the specified hardness, so that the compressive stress on the surface has sufficient fatigue resistance, and then the cemented carbide drill teeth are inserted..

The convex and pointed bit design can achieve the fastest perforation efficiency, and is most suitable for medium and soft rocks with low grindability..

For grindstone SD50 DTH Hammer Hard rock, flat drill bit can increase the life of the drill bit.If the outer edge of the button is large enough, you can improve the life of the drill by grinding the drill several times and reduce the cost of use.In addition, the concave button bit can also be applied to this kind of hard rock with high grindability..

As shown below,Concave drill bits are more suitable for medium-hard rocks with well-developed joints and many fissures, Can effectively reduce the probability of hole deflection, which was also mentioned in the previous article series.

Practical application

Drilling in open-pit mines and quarries usually requires a more durable down-the-hole impactor, because the quarry is usually a long-term work, if the impactor is frequently replaced, it is too cost-effective.Some good down-the-hole impactors can be repaired and used many times before being completely replaced, such as changing the direction of the outer tube of the impactor..

Drilling of building stone (marble, etc.) pays more attention to the straightness of the hole.89mmIn borehole drilling, the down-the-hole type is usually better than the top hammer type..

Exploration drilling needs to work on relatively remote sites with poor related facilities.Therefore, the requirements for the down-the-hole impactor are simple design, high reliability, and adapt to high wind pressure drilling..

Reverse circulation percussion drilling is also commonly used. This sampling method is relatively cost-saving for diamond core drilling..The reverse circulation impactor uses the same process as the ordinary down-the-hole impactor, but uses a reverse circulation drill pipe. High-pressure air is blown in through the gap between the inner and outer walls of the drill pipe, and then the drill cuttings are discharged from the inner wall of the drill pipe , And then use a dust bag to collect drill cuttings, as shown in the figure below.

In actual use, an important factor must always be considered, that is, the rig.An experienced driller can effectively adjust the drilling parameters to reduce the probability of failure of the impactor and increase the life of the impactor.

There are many choices of impactors on the market, some are cheap and some are high-end.But to measure the value of the impactor is not only to look at the material and design itself, but also to consider the balance between the efficiency brought to the user and the cost of Iwami..

For example, an impactor is cheap and durable, but its fuel consumption is high. As a result, the cost of rock rice is very high. This cannot be said to be a good impactor..The price of another impactor is very high, but the efficiency is also high, and the cost per rock meter is low, so this is a good impactor.

Of course, as a user, you also need to consider whether the impactor manufacturer can provide sufficient technical support and instructions for use. This is also very important, which can effectively help our users improve drilling efficiency and reduce operating costs..

Preservation of drill pipe

First, blow the air to remove the water inside the drill pipe, and open the shank lubrication device at the same time. In principle, it is better to see the shank lubricating oil at the bottom of the drill pipe..

Second, the outside of the drill pipe, including the threaded part and the main part of the drill pipe, must be wiped clean.At the same time, a rubber cover should be added to the male and female joints (as shown below) to prevent pollutants from entering.

Saving and reactivation of the impactor

Short-term preservation, Follow the steps below:

First, blow the air to remove the moisture in the impactor;

Second, add 1 liter of shank oil from the upper joint part;

Third, turn on the wind and blow for about 10 seconds, so that the internal parts of the impactor can be fully lubricated;

Fourth, just like the drill pipe, cover the upper joint and the lower joint with rubber caps;

Fifth, place the impactor horizontally in a dry environment.

Long-term preservation, Slightly different

the first,Air blow to remove the moisture in the impactor;

Second, loosen the upper joint and the lower joint, and disassemble the impactor;

Third, check and wipe all internal parts, preferably in a clean room;

Fourth, use suitable lubricating oil to moderately lubricate all parts;

Fifth, assemble the impactor and cover the upper and lower joints with rubber caps;

sixth,Place the impactor horizontally in a dry environment.

Re-enableThe impactor requires the following three steps

First, disassemble the impactor, inspect all internal parts,If you find that the surface of some parts is oxidized, you need to sand the oxidized part with sandpaper..

If it is directly put into use without testing, it is likely to cause premature failure of the impactor.

second,Clean each part, wipe it clean, and lubricate it,

Third, assemble the cleaned and lubricated parts into an impactor, which can then be put into use.

After reading the above article, many people may think that we usually put it casually, but we still use it.?!

Many users will record the wear and tear of drilling tools, such as an impactor used for several months, etc..In today's sluggish market and fierce competition, the price of Iwami drilling is declining. The editor advises our users of down-the-hole drilling rigs to try to work hard on maintenance, such as using and storing drilling tools in accordance with our recommended methods. Carry out reasonable maintenance and lubrication according to the requirements, and try to see if the life of the drilling tool can be longer than before, which will help you save more money.

Machines are more reliable than humans,If you treat the machine well, the machine will treat you well

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2021 Alashankou 90 down-the-hole drill manufacturer calls for customization

2021 Alashankou 90 down-the-hole drill manufacturer calls for customization

Shandong Yuxing Machinery Co., Ltd. is located in Xiangguang Economic Development Zone, Yanggu County, Liaocheng City, with convenient transportation. It is a company that produces drilling tools in the drilling tool industry and has domestic production and inspection equipment..The business scope includes rock drilling tools, drill rods, drill bits, light drilling tools, heavy drilling tools, down-the-hole drilling tools, coal machinery and milling gears, etc., and the business covers all fields of rock drilling system.Production and sales of other related machinery and equipment, etc..

In the standard, the matching tolerances of the diameter of the shank and the shank are stipulated.There are three types of shank (flange) shank, shank (lug) shank and spline shank, and shoulder shank for light pneumatic rock drills.The shank of the heavy-duty rail type rock drill is always installed in the shank sleeve.Can be regarded as a part of a rock drill.Shank shank or spline shank.In the case of the same clearance between the shank and the shank, the longer the length of the shank, the less likely to be deflected when impacting the shank, which reduces the rock drilling speed, reduces the wear with the shank, and reduces the wear of the shank at the same time. life.If the length of the shank is too long, it will increase the weight of the drill rod itself and the rock drill. The shank must have a moderate length. At present, there are three kinds of shank lengths in the world for pneumatic rock drills, 108mm and 159mm..Which only applies to small rock drills.


The leading edge was originally made of 70 mm long alloy pieces, and the chipping rate of the drill bit was 54% after grinding. Two pieces of 35 mm were used and welded..The leading blade rarely breaks. The four-wing blade uses two 22 mm long pieces to replace the original 45 mm long piece. (3) The welding stress of the thick welding layer is used..Because the solder layer is thicker.The greater the plastic deformation, the greater the bending of the alloy sheet due to the shrinkage of the steel body. Tests have shown that the weld gap has increased from -015 mm to 05 to 06 mm..Effect.Secondly, keeping the welded bit at 200-250C for 8 hours can also greatly reduce the welding stress..(4) Enlarge the section of Shuyi brazing wing and add fire, DTH Hammer DHD 380 It can inlay and weld the rigidity and loose relay of the cemented carbide substrate, such as when the height of the brazing wing is three times the height of the alloy sheet.

Damage Types and Causes of Cemented Carbide Bits for Deep Hole Drilling

The damage of deep-hole rock drilling cemented carbide bit is mainly caused by the fracture of the bit body and the damage of the cemented carbide piece..

(1) The drill bit body is broken

The main fracture parts are the leading edge, the fin and the head and the connecting part. The main reason for the fracture is the insufficient strength of the drill bit body, the design section size is too small, and the forging temperature is too high or too low..Therefore, in addition to the reasonable design size, the forging temperature must be strictly controlled when manufacturing the drill bit.At present, most of the bit body materials use 40Cr steel, the forging temperature should not exceed 1250C, and the heating time in the furnace should not exceed two hours.If the temperature of individual workpieces is too high, forging can be carried out after the blanks are cooled to 1250C after being discharged from the furnace.

(2) The cemented carbide sheet is damaged


The drill bit for the down-the-hole rock drill works under heavy conditions.In the rock below the medium hardness, the damage rate of the alloy sheet is about 5%, the damage rate in the hard rock is about 10%, and the damage rate in the extremely hard rock is up to 20%..

The main types of damage to the cemented carbide sheet are

Crumble

The full length of the front edge is broken along the edge direction.The reason for the chipping is the inconsistent height of the drill blade.In use, the high-edge part bears all the impact load and axial pressure, so the edge is chipped.Therefore, after the drill bit is sharpened, use a special gauge to check whether the blade surfaces are on the same plane, and control the height not to exceed 0.1mm, this can basically collapse the edge.

Collapse angle

Most of the chipping occurs on the wing edge.Mainly due to the fact that the alloy sheets are not inlaid, and some extend too much.When rotating during rock drilling, the single wing touches the hole wall, causing the alloy chip to collapse..Therefore, the alloy sheet should be prevented from shifting when inserting.Generally the amount of extension should not exceed 0.5mm.When grinding, use a special gauge to check, the radius of each part of the wing should be the same, and the deviation should be within 0.Within 1 mm.After taking such measures, the corners can be greatly collapsed..


Fragment

In deep hole drilling, fragment damage accounts for a larger proportion.The main reason is that the drill bit bears high impact load during work, and the working stress is relatively large; secondly, the welding is on time, the blade generates internal stress.Under the combined action of the two stresses, the middle crack fragments are caused.

Precautions for the use of cemented carbide drills

1. When carrying the drill bit down the well, the cutting edges should not collide with each other, so as not to damage the cutting edges and impinge the use of them;

2. When installing the drill bit, the coal dust in the uranium rod hole must be cleaned, and the joints must be checked for good condition. Only after confirming that the drill bit is intact, the drill bit can be inserted into the hole to install the mold pin, and the mold pin should not be too loose;

3. During drilling, if it is found that the drilling speed is reduced and there is too much coal at the edge of the hole, it is necessary to pull the drill pipe back and forth several times in a rotating state, and then continue drilling after pulling out the coal;

4. After drilling, remove the drill bit, wipe off the dust, and pack it up for the next drilling;

5. Drilling in hard coal seams or rocks with a depth of more than two meters should be drilled with a drill pipe set, that is, drill with a short drill pipe first, and then gradually lengthen the drill pipe. This can reduce vibration during drilling and reduce labor. strength.


If it is too low, it is easy to produce "topping". Because the rock drill has two water supply methods: central water supply and side water supply, the adapter shank also has two corresponding structures. The central water supply shank has a seal at one end of the water inlet and flushing needle tube. In order to prevent water from flowing back into the rock drill; the shank of the side water supply should also be sealed on both sides of the day when the shank enters the water. The shank used in some hydraulic rock drills.Drill shoulder, forged shoulder structure of hexagonal drill rod.It has a greater impact on the life of the drill rod. For example, the earlier drill shoulder is a flange shape with a thickness of 12mm, and smaller arcs (R3mm) are used on both sides of the flange to transition to the drill tail and drill rod. The arc is too small, and the stress is concentrated, causing 60% to 90% of the drill rod to be broken, occurring on both sides of the drill shoulder, and the life of the drill rod is shortened by more than 2/3. By improving the arc of the drill shoulder (R30mm), This problem is solved.5615151025

Using the function of high short beams, the alloy sheet is affected by the existing beams in the work. The use of several short slices instead of long slices can greatly reduce the function of the beams, but it should not be too short, otherwise it will reduce the welding strength and lead the edge. The original 70 mm long alloy sheet.The fragment rate of the drill bit after grinding once reaches 54%.After switching to two 35mm pieces and welding, the leading edge rarely breaks. The four-wing blade uses two 22mm long pieces to replace the original 45mm long piece..Welding stress with thick welding layer, because the thicker the welding layer, the greater the plastic deformation, which can greatly cause the bending of the alloy sheet due to the shrinkage of the steel body. Tests have shown that the weld gap has increased from -015 mm to 05 ~ 06 mm, DTH Hammer DHD350 Effect.Secondly, heat the welded bit at 200-250, C for 8 hours.

The applicable range of layered rock drill bits

Layered drill bit, as the name suggests, is a type of drill bit that is connected by layer structure.This type of drill bit belongs to the industry-specific accessories, and meets the standard and particularity of the use of rock drill bits in use and structure, so it is generally not common on the market.The applicable drilling rig model for layered drills isKHYDSeries of electric rock drills are currently supporting rock drilling hardness coefficients 10The best drill bit around the level.

The layered drill bit is shown in the figure below:

MinuteAs shown in the figure above, the layer drill bit is formed by a variety of separate alloy sheet drill bits. The number of combinations depends on the drilling diameter requirement. The maximum reamable diameter of the drill bit in the display is130mm, Of course, it can be connected to a larger size jacket.The advantage of using a layered drill bit is that through multi-layer intersection, the drill bit can ream and advance the rock layer separately when rotating and drilling. The alloy in the drill bit is relatively sharp, which can speed up the simultaneous advancement of the drill bit and the subsequent drill pipe..

The application areas of layered drill bits include some rock drilling projects, and the usable range of different rock types under various hardness coefficients.Common types of rocks are: marble, granite, limestone, etc. These rocks have high hardness, and only layered rock drill bits can be used to effectively and quickly advance rock drilling..